實驗結果顯示陶瓷微粒錫基複合鍍層於輕、中負荷下其接觸熱阻略高於純錫薄膜之情況；而於高負荷下其接觸熱阻則較小於純錫薄膜之情況。由SEM觀察得知，陶瓷微粒填入空隙及其本身之高絕熱性為影響接觸熱阻的二項主要因素。至於純金屬磨鍍薄層之研究則顯示錫磨鍍薄層之接觸熱阻較小於純銅試片之情況，然而，鋁及鋅磨鍍薄層之接觸熱阻則較高。由SEM觀察得知，錫磨鍍薄層為均勻薄膜結構，而鋁及鋅之磨鍍薄層則為不均勻之接合部成長組織，故影響純金屬磨鍍薄層接觸熱阻之主要因素為微真接觸面積之大小。本研究因此而提出以接觸熱阻的變化反推界面間陶瓷微粒分佈型態與實際真接觸面積之構想。 The variations of thermal contact resistance between the interfaces were experimentally measured for the tin composite coatings in this study. The normal load and heating temperature were selected as the major parameters. Moreover, the experimental results were compared with that of pure tin film to investigate the effects of ceramic particles on thermal contact resistance. Furthermore, the tribo-coatings resulted from tin, aluminum and zinc rubbing with copper specimens in dry friction condition were also used to investigate the effects of the tribo-coatings on thermal contact resistance.
The experimental results showed that the thermal contact resistance of the tin composite coatings was slightly higher than that of the pure tin film under small and middle load. However, it showed smaller than that of the pure tin film under high load. According to the SEM observations, the insert of ceramic particles and its heat-insulating characteristic were the major two factors for thermal contact resistance. On the other hand, the experimental results showed that the thermal contact resistance of the tin tribo-coatings was slightly smaller than that of the pure copper specimens. However, it showed higher for the aluminum and zinc tribo-coatings. According to the SEM observations, the tin tribo-coatings showed uniform film structure, and the aluminum and zinc tribo-coatings showed the structures of junction growth. Therefore, the major factor for thermal contact resistance of the tribo-coatings was real contact areas between the interfaces. The ideas of using the thermal contact resistance variations to clarify the distributions of ceramic particles and the real contact areas between the interfaces were proposed in this study.